Epheser 4:18

More literally, "Being darkened in their understanding," that is, their intelligence, or perceptions (compare Eph 5:8; Act 26:18; Th1 5:4-5). alienated--This and "darkened," imply that before the fall they (in the person of their first father) had been partakers of life and light: and that they had revolted from the primitive revelation (compare Eph 2:12). life of God--that life whereby God lives in His own people: as He was the life and light in Adam before the irruption of death and darkness into human nature; and as He is the life in the regenerate (Gal 2:20). "Spiritual life in believers is kindled from the life itself of God" [BENGEL]. through--rather as Greek, "on account of the ignorance," namely, of God. Wilful ignorance in the first instance, their fathers not "choosing to retain God in their knowledge." This is the beginning point of their misery (Act 17:30; Rom 1:21, Rom 1:23, Rom 1:28; Pe1 1:14). because of--"on account of." blindness--Greek, "hardness," literally, the hardening of the skin so as not to be sensible of touch. Hence a soul's callousness to feeling (Mar 3:5). Where there is spiritual "life" ("the life of God") there is feeling; where there is not, there is "hardness."

We have gone through the former part of this epistle, which consists of several important doctrinal truths, contained in the three preceding chapters. We enter now on the latter part of it, in which we have the most weighty and serious exhortations that can be given. We may observe that in this, as in most others of Paul's epistles, the former part is doctrinal, and fitted to inform the minds of men in the great truths and doctrines of the gospel, the latter is practical, and designed for the direction of their lives and manners, all Christians being bound to endeavour after soundness in the faith, and regularity in life and practice. In what has gone before we have heard of Christian privileges, which are the matter of our comfort. In what follows we shall hear of Christian duties, and what the Lord our God requires of us in consideration of such privileges vouchsafed to us. The best way to understand the mysteries and partake of the privileges of which we have read before is conscientiously to practise the duties prescribed to us in what follows: as, on the other hand, a serious consideration and belief of the doctrines that have been taught us in the foregoing chapters will be a good foundation on which to build the practice of the duties prescribed in those which are yet before us. Christian faith and Christian practice mutually befriend each other. In this chapter we have divers exhortations to important duties. I. One that is more general (Eph 4:1). II. An exhortation to mutual love, unity, and concord, with the proper means and motives to promote them (Eph 4:2-16). III. An exhortation to Christian purity and holiness of life; and that both more general (Eph 4:17-24) and in several particular instances (Eph 4:25 to the end).

4:18 Their minds are full of darkness because their minds are closed and hearts are hard (see 2 Cor 4:4).